NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 918
SOUTHWESTERN BELL 236
NEW CINGULAR WIRELESS PCS, LLC - IL 93
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 50
T-MOBILE USA, INC. 49
VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 36
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 918-483 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 PORTER OK
— 918-484 not yet reported which blocks → CROSS TEL. CO. 1985 PORUM OK
— 918-485 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 WAGONER OK
— 918-486 9XXX which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 COWETA OK
— 918-487 0XXX3XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 BRAGGS OK
— 918-488 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-489 not yet reported which blocks → CROSS TEL. CO. 1985 GORE OK
— 918-491 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-492 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-493 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-494 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-495 4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-496 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-497 0XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-498 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 WUNIONTOWN OK
— 918-499 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-501 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 918-503 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J MULDROW OK
— 918-506 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 TAHLEQUAH OK
— 918-510 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 918-512 0XXX1XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 SAPULPA OK
— 918-513 1XXX2XXX3XXX8XXX · 2 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 TULSA OK
— 918-514 0XXX1XXX3XXX4XXX · 4 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 SAND SPG OK
— 918-515 0XXX1XXX5XXX · 2 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 CATOOSA OK
— 918-516 1XXX2XXX5XXX8XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 OWASSO OK
— 918-517 2XXX5XXX6XXX8XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 SPERRY OK
— 918-518 0XXX1XXX5XXX6XXX · 3 holders which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 JENKS OK
— 918-519 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-520 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-521 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-522 not yet reported which blocks → OKLAHOMA WESTERN TEL. CO. 2014 BUFFALOVLY OK
— 918-523 0XXX4XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-524 2XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-525 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 TAHLEQUAH OK
— 918-526 0XXX1XXX4XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - OK 409F TULSA OK
— 918-527 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-528 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J JENKS OK
— 918-529 6XXX which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1142 WMAYSVILLE OK
— 918-531 not yet reported which blocks → TOTAH COMMUNICATIONS, INC. 2030 WANN OK
— 918-532 3XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 COPAN OK
— 918-533 9XXX which blocks → UNITED STATES CELLULAR - OK 6272 MIAMI OK
— 918-534 8XXX which blocks → SOUTHWESTERN BELL 9533 DEWEY OK
— 918-535 5XXX which blocks → TOTAH COMMUNICATIONS, INC. 2030 OCHELATA OK
— 918-536 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 RAMONA OK
— 918-537 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MUSKOGEE OK
— 918-538 not yet reported which blocks → CIMARRON TEL. CO. 1982 BLACKBURN OK
— 918-540 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MIAMI OK
— 918-541 3XXX4XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 MIAMI OK
— 918-542 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MIAMI OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.